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Option 1: Chlorella - Chlorella is a type of algae that is known for its high nutritional value. While it is rich in protein, it does not surpass soybean in terms of protein content.
Option 2: Dunaliella - Dunaliella is a type of algae that is often used in the production of beta-carotene. It is not known for its high protein content.
Option 3: Scenedesmus - Scenedesmus is a type of algae that is also rich in nutrients, but it does not have the same protein content as spirulina.
Option 4: Spirulina - Spirulina is a type of algae that is considered a wonder crop due to its high protein content. It contains about 70% protein, which is even higher than that of soybean. Spirulina has gained popularity as a dietary supplement and food source due to its nutritional value.
In conclusion, out of the given options, spirulina is the algae with about 70% protein, surpassing soybean in food value.